Telephone numbers: Puerto Rico Customer Service 1-800-331-0500 Prepaid Customer Service (787) 397-5990 Corporate Customer Service (787) 399-CORP (399-2677) Sales 1-800-845-6059 Corporate Sales (787) 398-2111 Information from your Mobile Unit 611 Telephone numbers: Virgin Islands Corporate Customer Service (340) 690-5000   St. Thomas Customer Service (340) 777-7777 St. Croix Customer Service (340) 690-1000 Information from your Mobile Unit 611 Mailing address: Puerto Rico Cingular Wireless PO Box 192385 San Juan PR 00919-2385   Mailing address: Virgin Islands Cingular Wireless Crown Bay Marina Ste.#312 St. Thomas VI 00802   Mailing address to send bill payments: Puerto Rico Cingular Wireless PO Box 15067 San Juan PR 00902-8562   Mailing address to send bill payments: Virgin Islands Cingular Wireless Crown Bay Marina Ste.#312 St. Thomas VI 00802   Corporate Offices: Puerto Rico Cingular Wireless 103 Ortegón Street Guaynabo Puerto Rico 00966   Corporate Offices: Virgin Islands Cingular Wireless Crown Bay Marina Ste.#312 St. Thomas VI 00802